1. G. P. Agrawal, Nonlinear Fiber Optics, Acad. Press, New York (2001).
2. V. E. Zakharov and A. B. Shabat, “Exact theory of two-dimensional self-focusing and one-dimensional self-modulation of waves in nonlinear media,” Sov. Phys. JETP, 34, 62–69 (1972).
3. R. K. Dodd, J. C. Eilbeck, J. D. Gibbon, and H. C. Morris, Solitons and Nonlinear Wave Equations, Acad. Press, London (1982).
4. V. E. Zakharov, “Stability of periodic waves of finite amplitude on the surface of a deep fluid,” J. Appl. Mech. Tech. Phys., 9, 190–194 (1968).
5. V. E. Zakharov and A. B. Shabat, “Interaction between solitons in a stable medium,” Sov. Phys. JETP, 37, 823–828 (1973).